The Twelfth day of Christmas and the Twelfth Night of Christmas
The Twelfth day of Christmas and the Twelfth Night of Christmas is held on January 5. Western Christianity. This event in the first decade of the month January is annual. 
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Twelfth Night (also known as Epiphany Eve) is a Christian festival on the last night of the Twelve Days of Christmas, marking the coming of the Epiphany.
The Twelve Days of Christmas, also known as Twelvetide, is a festive Christian season celebrating the Nativity of Jesus. In some Western ecclesiastical traditions, "Christmas Day" is considered the "First Day of Christmas" and the Twelve Days are 25 December to 5 January, inclusive, with 6 January being a "thirteenth day" in some traditions and languages. However, 6 January is sometimes considered Twelfth Day/Twelfth Night with the Twelve Days "of" Christmas actually after Christmas Day from 26 December to 6 January. For many Christian denominations—for example, the Anglican Communion and Lutheran Church—the Twelve Days are identical to Christmastide, but for others, e.g. the Roman Catholic Church, Christmastide lasts longer than the Twelve Days of Christmas.
Similar holidays and events, festivals and interesting facts
New Year's Eve party in Scotland on January 2
Sausage Day in Clitheroe, Lancashire, UK on January 5
Hansel Monday in Scotland and Northern England on January 6 (Celebrate the first Monday of the new year, give gifts at this time);
Handsel Monday in Scotland on January 6 (celebrated on the first Monday of the year);
Distaff Day on January 7 (medieval Europe);
Margaret Thatcher Day on Falkland Islands on January 10
St. Knuts Day in Norway and Sweden on January 13 (the 20th and last day of the Christmas season)